The finds of Geoffrey Marcy are frightening in that______.
A.it's the first time that astronomers have discovered such space entity
B.it substantially implies some kind of subversion to our present realization
C.it is an entire negation of the present astronomic research
D.they discovered the first extra-solar planet in astronomic study
第1题
为了做好汛期预防措施,施工现场临时道路起拱为5%,两侧做宽300mm、深()的排水沟。
A.100mm
B.200mm
C.300mm
D.400mm
第4题
为了做好汛期预防措施,施工现场临时道路起拱为5%,两侧做宽()、深200mm的排水沟。
A.100mm
B.200mm
C.300mm
D.400mm
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